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    <title>ShellCheck: SC2108 – In `[[..]]`, use `&&` instead of `-a`.</title>
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    <h1>SC2108 – ShellCheck Wiki</h1>
    <a href="https://github.com/koalaman/shellcheck/wiki/SC2108">See this page on GitHub</a>
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    <h2 id="in--use--instead-of--a">In <code>[..](..)</code>, use
<code>&amp;&amp;</code> instead of <code>-a</code>.</h2>
<h3 id="problematic-code">Problematic code:</h3>
<div class="sourceCode" id="cb1"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb1-1"><a href="SC2108.html#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="kw">[[</span> <span class="st">&quot;</span><span class="va">$1</span><span class="st">&quot;</span> <span class="ot">=</span> <span class="st">&quot;-v&quot;</span> <span class="er">-a</span> <span class="ex">-z</span> <span class="st">&quot;</span><span class="va">$2</span><span class="st">&quot;</span> ]]</span></code></pre></div>
<h3 id="correct-code">Correct code:</h3>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="SC2108.html#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="kw">[[</span> <span class="st">&quot;</span><span class="va">$1</span><span class="st">&quot;</span> <span class="ot">=</span> <span class="st">&quot;-v&quot;</span> <span class="kw">&amp;&amp;</span> <span class="ot">-z</span> <span class="st">&quot;</span><span class="va">$2</span><span class="st">&quot;</span> <span class="kw">]]</span></span></code></pre></div>
<h3 id="rationale">Rationale:</h3>
<p><code>-a</code> for logical AND is not supported in a
<code>[[ .. ]]</code> expression. Use <code>&amp;&amp;</code>
instead.</p>
<h3 id="exceptions">Exceptions:</h3>
<p>None.</p>
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    <p style='font-size: 80%'><a href="../index.html">ShellCheck</a> is a static analysis tool for shell scripts. This page is part of its documentation.</p>
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